Different class / Joanne Harris.

Enhanced descriptions from Syndetics:

"It's Goodbye, Mr. Chips meets The Bad Seed . Joanne Harris's latest novel, Different Class , has a killer elevator pitch and, what's more, it delivers on its intriguing premise....[A] rich, dramatic tale that builds to a surprising conclusion." -- T he Washington Post

"Harris delivers mischief and murder to an English prep school in Different Class , a delightfully malicious view of privileged students with overly active imaginations." -- The New York Times Book Review

From the New York Times bestselling author of Chocolat comes a dark, psychological suspense tale in the tradition of Patricia Highsmith about a sociopathic young outcast at an antiquated prep school and the curmudgeonly Latin teacher who uncovers his dangerous secret.

After thirty years at St. Oswald's Grammar in North Yorkshire, England, Latin master Roy Straitley has seen all kinds of boys come and go. Each class has its own clowns, rebels, and underdogs--all who hold a special place in the old teacher's heart. But every so often there's a boy who doesn't quite fit the mold. A troublemaker. A boy with darkness inside.

With insolvency and academic failure looming, a new headmaster arrives at the venerable school, bringing with him new technology, sharp suits, and even girls to the dusty corridors. But while Straitley does his sardonic best to resist these steps toward the future, a shadow from his past begins to stir again. A boy who still haunts Straitley's dreams twenty years later. A boy capable of terrible things.